For myself, I go caseless because, 1) I like the feel of a solid metal device in my hand over plastic or rubber, and 2) it's thinner without a case, and easier to handle.

I have a leather wallet case that the phone slides into easily for when its in my pocket, as I wouldn't want it to get damaged being jostled around, but it's quick to take out when I want to use it.

My $99 Android phone (out-of-pocket, no contract) that looks nice (to me at least), has 6.0.1, and serves all my phone needs quite nicely has no case. If I drop it, it'll probably be cheaper at this point to replace it. Actually, I have dropped it a few times with no damage. I could care less about the thing at this point, even though it is easily the best phone I've ever owned.

It's actually quite liberating.

I tried to go caseless, but thin metal smartphones are way too slippery. Every time I set my phone down on something, it always seemed to have some velocity towards the floor, just a matter of time.

Also, it feels wrong setting the iPhone down on a bar table or whatever. Either the touchscreen lays against the table or it's seesawing on its protruding camera lens.

Putting it in a minimal rubber case took an $800 load off my mind for $15.